Jpanel ไม่ยอมแสดงขึ้นมา มันผิดตรงไหนครับช่วยดูให้หน่อย

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.KeyStroke;

/**
 *
 * @author chanvit.jar
 */
public class pre_budget extends javax.swing.JFrame {
    
    userClass user = new userClass();
    String username = user.getUsername();

    /**
     * Creates new form pre_budget
     */
    public pre_budget() {
        initComponents();
        setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        setBounds(100, 100, 508, 375);
        //setExtendedState(JFrame.MAXIMIZED_BOTH);
        setTitle("งบประมาณล่วงหน้า");
        
        //set MenuBar
        JMenuBar menuBar = new JMenuBar();
        JMenu menu = new JMenu("File");
        menu.setMnemonic(KeyEvent.VK_F);
        
        JMenuItem signout = new JMenuItem("ออกจากระบบ");
        signout.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_E,ActionEvent.CTRL_MASK));
        signout.setToolTipText("ออกจากระบบ");
        signout.addActionListener(new ActionListener () {
            public void actionPerformed(ActionEvent e)
            {
              index id = new index();
              id.setVisible(false);
              
              login lg = new login();
              lg.setVisible(true);
              dispose();          
            }
        });
        
        menu.add(signout);
        
        menuBar.add(menu);
        setJMenuBar(menuBar);
        ////////////////////////////////////////////////////////////////////////
        
        //set Search
        panelSearch panelsearch = new panelSearch();
        getContentPane().removeAll();
        getContentPane().add(panelsearch, BorderLayout.CENTER);
        getContentPane().doLayout();
        ////////////////////////////////////////////////////////////////////////
        
    }

    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 400, Short.MAX_VALUE)
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 300, Short.MAX_VALUE)
        );

        pack();
    }// </editor-fold>                        

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(pre_budget.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(pre_budget.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(pre_budget.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(pre_budget.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new pre_budget().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify                     
    // End of variables declaration                   
}

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import javax.swing.BorderFactory;
import javax.swing.JTextField;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.SwingConstants;
import javax.swing.border.Border;

/**
 *
 * @author chanvit.jar
 */
public class panelSearch extends javax.swing.JPanel {

    /**
     * Creates new form panelSearch
     */
    public panelSearch() {
        initComponents();
        setLayout(null);
        
        JLabel lbsearchno = new JLabel("เลขที่");
        lbsearchno.setBounds(108, 33, 239, 31);
        add(lbsearchno);
        
        JTextField txtsearchno = new JTextField();
        txtsearchno.setBounds(115,33,239,31);
        add(txtsearchno);
        
        JLabel lbsearchyear = new JLabel("ปี");
        lbsearchyear.setBounds(108, 36, 239, 31);
        add(lbsearchyear);
        
        JTextField txtsearchyear = new JTextField();
        txtsearchyear.setBounds(115,36,239,31);
        add(txtsearchyear);
        
        JButton btnsearch = new JButton("ค้นหา");
        btnsearch.setBounds(108,36,239,31);
        add(btnsearch);
        
    }

    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
        this.setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 400, Short.MAX_VALUE)
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 300, Short.MAX_VALUE)
        );
    }// </editor-fold>                        


    // Variables declaration - do not modify                     
    // End of variables declaration                   
}